[Coco] max ram for a tre (coco 3)

[Paul T. Barton]

Kevin,

--- mmarlett at isd.net wrote:
> 
> 
> Kevin,
> 
> Stock MMU in a CoCo3 is 512k, that is a 6bit
> MMU. Add in two bits and that
> goes to 2MB. That is the limit of Level II
> OS-9/ NitrOS-9.
> 
> Now that is not to say that you couldn't have a
> LARGE RAM disk. Paul Barton
> has had 64MB or maybe more already. Paul????

Here!

Yes, I agree, 2MB is more than enough,
until you cannot load anymore system
drivers. (Grrrr!) I want to have at least
4 IDE drives (actual drives, not partitions)
and have lots of device descriptors.

Yes, I have a tre 8mb and a tre 64mb.
Both working. undeer NitrOS-9 with the
Robert Gault "rammer" ramdisk drivers.

I am looking at DIMMs, the 32mb ones. PC-100
is way more than fast. When I understand how
they work, it's downhill from there.

Paul

Anybody making custom cases for re-packs?
Wood with plexiglas/lexan fronts?

I want to put the mobo vertical with the
joystick jacks out the front and on the
right edge (at front). Then the floppies
would be vertical & at the top.

(use courier font)

 !\-----------\ 
 ! \           \ 
 !  \           \ 
 !   \           \ 
 !    \           \ 
 !     \           \ 
 !      \           \ 
 !       \           \    
 !        \___________\
 !         !           !
 !         ! ===       !
 !         ! |||       !
 !         ! |||     @ !
 !         ! |||     @ !
 !         ! |||     @ !
 !         ! |||     @ !
  \        ! ===       !
   \       !         o !
    \      !           !
     \     !         o !
      \    !         o !
       \   !         R !
        \  !         K !
         \ !           !
          \!___________!


---

> You will find that 2MB is a huge amount of RAM
> under NitrOS-9. You will run
> out of system RAM before anything else. Level
> III greatly improves on
> that....Error #207..........
> 
> Regards,
> 
> Mark
> Cloud-9
> 
> >Hi,
> >
> >	What is the maximum supported ram for
> > a tre (coco 3)? The schematic
> > in the service manual does not lead me to
> > believe it is more than 512k?
> >
> >					kevin



	
		
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